The problem is that if I want to leave my notebook to download something big, I need to make some activity. Move mouse, use keyboard for example. Even if it works on circuit power.Some time after screen turns blank (30 min) WiFi freezes. All connections aren't lost, but downloads are stopped. Hibernation is not allowed in power settings.I've tried searching about this problem, but didn't find anything similar.

Thanks. I'll try to use a method from this post, but I'm not shure this will help.I've googled more on these theme. Seems it's a problem with linux iwl3945 driver.I've found a patch.http://james.colannino.org/downloads.html Hope it may help.